No, it wasn't. I knew that part, but thank u. I was asking cause my betta just tried to eat an already dead tetra, that I know he didn't kill. He ate the eyeballs (yesterday) and now I get home and see that his 'stomach' (right behind his gills and below em) is severely swollen and he won't eat.

Yeah, they WILL eat off of dead fish. I think that someone else posted about their betta eating part of a neon tetra. I know they will eat the fry of other fish. They'll eat their own fry too. Just fast him for a few days and see what happens. I hope he'll be okay.

Betta's are a carnivorous fish so they will scavange other dead fish. If he is bloated them try giving him a flake or 2 of tropical fish flakes(they are all vegetable and high in fiber), then fast him for 2 to 3 days and he should pass the poo quickly.

Sry it's been so long since I updated, but Mu died during the night after I posted this. Things've been so hectic I haven't had time to get on. Thank u all of you though. I'll know next time (which there hopefully won't be one) it happens.